{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Transition state theory , applied to the rate constant k2 that characterizes the irreversible step , provides activation parameters consistent with a highly organized transition state ( Delta S ( |= ) = - 43 ( 7 ) cal . mol ( - 1 ) K ( - 1 ) ) and a remarkably low enthalpic barrier ( Delta H ( |= ) = 6 . 7 ( 2 ) kcal . mol ( - 1 ) ) ."}
{"Chemical": []}